Cement spray gun

ABSTRACT

A spray gun for cement or the like material which has counternal moving parts, which is composed essentially of elements which are threadedly connected together and which may be readily threadedly disassembled for cleaning purposes. The gun comprises a Tee section with a plug and a pipe section connected with the aligned holes, respectively, of the Tee section, a plug of smaller diameter threadedly received in a central bore in the larger plug, an elongated tube threadedly connected to the interior of the smaller plug and extending axially through the Tee and through the larger pipe section, a nozzle connecting to the end of the tube by means of a female adapter, a threaded cap connected on the outer end of the pipe section adjacent the nozzle, aligned holes in the nozzle and the cap, a tapered recess on the inside of the threaded cap and a complementary tapered tip on the nozzle, a cement supply pipe connected to the third opening in the Tee section, means supplying cement under pressure to the cement supply pipe and a conduit with associated control valve supplying air under controllable pressure to the small plug.

United States Patent 1 Kellert [451 1 Jan. 2, 1973 [52] US. Cl..239/426, 239/434 [51 1 Int. Cl. ..B05b 7/08 [58] Field ofSearch....239/l0, 434, 398, 407, 8, 426,

' [56] References Cited UNITED STATES PATENTS 1,492,593 5/1924 Day..239/8 2,636,780 4/1953 Barnes ..239l398 X 2,054,136 9/1936 Pfaff etal. ..239/4l6.4

Primary ExaminerM. Henson Wood, Jr. Assistant Examiner-Gene A. ChurchAttorney-William S. Dorman [57] ABSTRACT A spray gun for cement or thelike material which has counternal moving parts, which is composedessentially of elements which are threadedly connected together andwhich may be readily threadedly disassembled for cleaning purposes-Thegun comprises a Tee section with a plug and a pipe section connectedwith the aligned holes, respectively, of the Tee section, a plug ofsmaller diameter threadedly received in a central bore in the largerplug, an elongated tube threadedly connected to the interior of thesmaller plug and extending axially through the Tee and through thelarger pipe section, a nozzle connecting to the end of the tube by meansof a female adapter, a threaded cap connected on the outer end of thepipe section adjacent the nozzle, aligned holes in the nozzle and thecap, a tapered recess on the inside of the threaded cap and acomplementary tapered tip on the nozzle, a cement supply pipe connectedto the third opening in the Tee section, means supplying cement underpressure to the cement supply pipe and a conduit with associated controlvalve supplying air under controllable pressure to the small plug.

1 Claim, 3 Drawing, Figures PATENTEDJAN 2 mm AIR CONTROL VALVE INVENTOKPAUL H. KELLERT ATTORNEY H e v m m F @u f 0 m n o w E Q 0 y 5 FIG.

CEMENT UNDER PRESSURE Ill! CEMENT SPRAY GUN The present inventionrelates to a spray gun for cement or similar materials and moreparticularly to a spray gun which is easily assembled for use andreadily disassembled for cleaning.

Many spray guns for cement and the like materials have been designed andproposed heretofore; for the most part, however, the spray guns aredifficult to assemble, are difficult to take apart for cleaningpurposes, many contain internal moving parts and others are bulky anddifficult to handle.

The present invention, on the other hand, utilizes a cement spray gunwhich is composed almost entirely of conventional plumbing or pipingcomponents as will hereinafter appear; the only elements which arespecially machined are the nozzle at the end of the air supply assemblyand the complementary cap which, together with the nozzle, provides themeans for ejecting the cement and forming the desired spray pattern. Theair supply is located centrally of the gun and terminates with thenozzle referred to above. The cement is introduced into the annularchamber surrounding the air supply assembly and at a distanceconsiderably upstream from the nozzle. The cement spray pattern isdetermined, first of all, by the position of the rotatable cap relativeto the nozzle and, secondly, by the pressure of the air to the airsupply assembly. No triggers or moving parts are required in the instantcement spray In light of the above, it is a principal object of thepresent invention to provide a cement spray gun which is relativelysimple to assemble.

It is a further object of the present invention to provide a cementspray gun which can be readily disassembled for cleaning purposes.

It is a further object of the present invention to provide a cementspray gun which has no moving parts.

It is a still further object of the present invention to provide a spraygun having an elongated air supply assembly extending through the gunand terminating in a nozzle, a threaded and adjustable cap on'the gunadjacent said nozzle, aligned openings in the nozzle and cap andcomplementary tapered surfaces on the end of the nozzle and on theadjacent portion of the cap.

It is a still further object of the present invention to provide a spraygun of the type described above wherein the spray pattern can be variedby adjusting the rotary position of the cap and a valve which suppliesair to the air supply assembly.

Other and further objects and advantageous features of the presentinvention will hereinafter more fully appear in connection with adetailed description of the drawings in which:

FIG. 1 is a longitudinal sectional view through the spray gun of thepresent invention;

FIG. 2 is an enlarged sectional view of the left hand end of the spraygun of FIG. 1; and

FIG. 3 is a side elevation of the spray gun with a diagrammatic showingof the connections to the air supply.

Referring to thedrawings in detail, FIGS. 1 and show'a spray gun,generally designated by the reference numerall0. The spray gun iscomposed of a central Tee member 12, a short pipe section or nipple 14threadedly engaging, at its right hand end, the internal threads at theleft hand opening 16 of the Tee 12; the

The Tee 12 is also provided with an opening 28 opposite from, and inalignment with, the opening 16. Openings l6, and 28 form the ends of thethroughpassageway of the Tee 12. The opening 28 is provided withinternal threads which mate with the external threads 30 of a hollowthreaded plug 32. The end 34 of the threaded plug 32 is provided with acentral opening 36 which is threaded so as to receive the externalthreads 38 of a smaller plug 40. The plug 40 is provided with a threadedbore 42 whose left hand end is countertapped to provide a threaded hole44.

An elongated pipe section or tube 46 of relatively smaller diameter(than the pipe section 14) is located within the spray gun 10 such thatthe right hand end of this tube 46 threadedly engages the threads in thehole 44. The left hand end of the tube 46 threadedly engages the righthand end of the internal bore 48 of a female adapter 50. The left handend of the threaded bore 48 of the connector 50 threadedly engages theright hand end of a short nipple 52 which constitutes a nozzle as willbe described hereinafter. The nipple 52 is provided with a central,longitudinally extending, opening 54 which is preferably slightlysmaller than the opening 22 and in axial alignment therewith. The outer,left hand,

end of the nozzle 52 is tapered at 56 so as to present a conical surfacesubstantially parallel to the conical surface of the opening 24, as bestshown in FIG. 2.

The Tee 12 is provided with a third threaded opening, 58 which isadapted to receive the upper threaded end of a hollow pipe 60. Theopening 58 defines a passageway in the Tee which is perpendicular to thethrough passageway described above. I

As best shown in FIG. 3, the small plug 40 is connected to an airconduit 62 in any convenient manner. A valve 64 is located in anyappropriate position along the conduit 62 to control the supply of airthrough the conduit 62 and into the gun It). Cement, under pressure, isprovided through the internal bore of the pipe 60 from any convenientsource (not shown).

The resulting air supply assembly, consisting of the plug 40, the tube46, the adapter 50 and the nozzle 52, provides a central flow, or jet,of air through the gun 10. The space between the foregoing elements andthe plug 32, Tee l2 and the pipe section 14 constitutes an annularchamber 66 in the gun for the cement which is supplied through the pipe60. Turning again to a consideration of FIG. 2, the cap 20 is adjustablewith respect to the pipe section 14; that is, the cap 20 can be turnedon itsthreaded connection 18 to move the same inwardly or outwardly withrespect to the gun and thereby vary the space between the conical tip 56of the nozzle 5.2 and the conical surface 24. The jet or flow of airfrom the opening 54 through the aligned opening 22 will create a Venturior jet effect in the space defined by the opening 24 and the tip 56 ofthe nozzle 52 so as to pull cement from the annular chamber 66. Thus, byvarying the position of the cap 20 and the quantity of air flowingthrough the gun by means of the valve 64, the resulting spray pattern ofthe cement can be varied to achieve any desired effect. Location of theopening 48 of the cement supply pipe 60 in a position sufficientlyrearward (or downstream) of the nozzle 52 will insure that the annularspace 66 will be filled with cement; thus, when the vacuum effect iscreated at the nozzle, as described above, the withdrawal (or ejection)of cement from the gun will be substantially uniform.

One of the principal advantages of the present invention resides in thefact that it can be readily disassembled for cleaning purposes. Exceptfor the nozzle 52 and the cap 20, the gun 10 is composed of essentiallyconventional plumbing or piping. By unscrewing the small plug 40 fromthe larger plug'32, the air supply assembly consisting of the plug 40,tube 46, adapter 50 and nozzle 52 can be completely removed from the gun10. This latter assembly can be further disassembled for cleaning ifdesired. Thereafter the pipe 60, plug 32, cap and pipe section 14 may beremoved from their threaded connections and these elements can becleaned if desired.

Also, it should be noted that there are no moving parts inside the gun10 which can go out of adjustment. The cement will be supplied under asubstantially constant pressure from any convenient source (not shown).As indicated above, the only controls are the adjustment of the valve 64and adjustment of the cap 20 with respect to the nozzle 52. The operatorneed not keep a trigger depressed during the operation of the gun 10.

From the foregoing description, it should be apparent that the cementwill turn a corner (or 90 angle) when passing from the pipe 60 into theannular chamber 66 towards the orifice 22. With this design the cementis forced around all sides of the orifice and is actually sucked throughby the jet effect previously described. In this regard it should bepointed out that the air is turned on first before the cement reachesthe orifice; the supply of cement under pressure is fed to the gun afterthe air is turned on, so that, when the cement does reach the orificethe desired pattern is created and the flow is continuous.

Whereas the present invention has been described in particular relationto the illustrations in the drawings, it should be understood that otherand further modifications may be made within the spirit and scope ofthis invention.

What is claimed is:

l. A cement spray gun comprising a hollow Tee section having two axiallyaligned openings defining a first passageway and a third openingdefining a second passageway perpendicular to said first passageway, a

hollow threaded pipe section having one end connected to said firstopening of said Tee section, a hollow plug threadedly connected to saidsecond opening of said Tee section, a cement supply pipe threadedlyconnecting with said third openingof said Tee section, means forsupplying cement under pressure to said cement supply pipe, a hollowthreaded cap threadedly engaging the other end of said pipe section, anelongated air supply assembly threadedly connected at one end to saidhollow plug and extending inwardly through said gun substantiallycoaxial with said first passageway and said threaded pipe section, saidair supply assembly termmatmg at one end in a nozzle ad acent saidhollow cap and at its other end in a connection extending externally ofsaid threaded plug, means for supplying air under controllable pressureto said connection on said air supply assembly, said nozzle having acentral opening therethrough for discharging a stream of air from saidair supply assembly, the tip of said nozzle having a conical surfacethereon, said threaded cap having a first opening of substantiallyconstant diameter in axial alignment with and larger than the centralopeningin said nozzle and a second conical opening extending inwardlyfrom said first opening in parallel relation with the conical surface ofthe tip of said nozzle, the space between said air supply assembly andthe interior of said spray gun defining an annular chamber for receivingcement from said cement supply pipe, said threaded cap being rotatablyadjustable on the other end of said pipe section so as to vary the spacebetween said second conical opening on said threaded cap and the conicalsurface on the tip of said nozzle, said air supply assembly including asecond and smaller hollow plug threadedly engaging a central opening inthe first-mentioned hollow plug, an elongated tubular member threaded atits ends extending inwardly through said spray gun and threadedlyconnected at one end to an inner threaded opening in said second, hollowplug, an internally threaded female adapter connected at one end to theother end of said tubular member, said nozzle being threadedly connectedto the other end of said adapter, whereby all of the elements of saidspray gun may be disassembled into their individual components by meansof the threaded connections so as to facilitate the cleaning of parts ofsaid spray gun.

1. A cement spray gun comprising a hollow Tee section having two axiallyaligned openings defining a first passageway and a third openingdefining a second passageway perpendicular to said first passageway, ahollow threaded pipe section having one end connected to said firstopening of said Tee section, a hollow plug threadedly connected to saidsecond opening of said Tee section, a cement supply pipe threadedlyconnecting with said third opening of said Tee section, means forsupplying cement under pressure to said cement supply pipe, a hollowthreaded cap threadedly engaging the other end of said pipe section, anelongated air supply assembly threadedly connected at one end to saidhollow plug and extending inwardly through said gun substantiallycoaxial with said first passageway and said threaded pipe section, saidair supply assembly terminating at one end in a nozzle adjacent saidhollow cap and at its other end in a connection extending externally ofsaid threaded plug, means for supplying air under controllable pressureto said connection on said air supply assembly, said nozzle having acentral opening therethrough for discharging a stream of air from saidair supply assembly, the tip of saiD nozzle having a conical surfacethereon, said threaded cap having a first opening of substantiallyconstant diameter in axial alignment with and larger than the centralopening in said nozzle and a second conical opening extending inwardlyfrom said first opening in parallel relation with the conical surface ofthe tip of said nozzle, the space between said air supply assembly andthe interior of said spray gun defining an annular chamber for receivingcement from said cement supply pipe, said threaded cap being rotatablyadjustable on the other end of said pipe section so as to vary the spacebetween said second conical opening on said threaded cap and the conicalsurface on the tip of said nozzle, said air supply assembly including asecond and smaller hollow plug threadedly engaging a central opening inthe firstmentioned hollow plug, an elongated tubular member threaded atits ends extending inwardly through said spray gun and threadedlyconnected at one end to an inner threaded opening in said second hollowplug, an internally threaded female adapter connected at one end to theother end of said tubular member, said nozzle being threadedly connectedto the other end of said adapter, whereby all of the elements of saidspray gun may be disassembled into their individual components by meansof the threaded connections so as to facilitate the cleaning of parts ofsaid spray gun.